Crazy Towers - very hard but enjoyable game

Crazy Towers
My goal was to create a enjoyable, but very hard game.
In my opinion it is one of the hardest puzzle/arcade game. The point is to build tower and put the player on top. The tower must be stable at least 5 seconds. Use the many objects including boxes, lines, glue, magnets and more.

The first part is quite easy...
the second part is hard...
the third and fourth parts are realy extreme